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JSS2: BASIC SCIENCE - 1ST TERM

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  1. Living Things (Habitat) | Week 1, 2 & 3
    8 Topics
    |
    1 Quiz
  2. Living Things (Uniqueness of Man) | Week 4
    9 Topics
    |
    1 Quiz
  3. Growth and Development | Week 5 & 6
    4 Topics
    |
    1 Quiz
  4. Chemicals | Week 7 & 8
    4 Topics
    |
    1 Quiz
  5. Work, Energy & Power | Week 9
    4 Topics
    |
    1 Quiz



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Topic Content:

  • Definition of Work
    • Joules Converter
    • Calculations Involving Work done
  • Definition of Power
    • Calculations Involving Power
    • Watt Converter
  • Definition of Energy
    • Calculations Involving Energy

What is Work?

Work can be defined as the product of force and distance through which an object moves in the direction of force applied.

Work (W) = Force (F) × distance (D)

= Newton × metre

= Joule (J)

1 J = 1 Nm

If the object doesn’t move, then no work is done.

Where Force is the product of mass and gravity or mass and acceleration (F = mg, or F = ma) (g = 10 m/s2)

The unit of work is Joule named after the scientist, James Prescott Joule, who did a lot of experiments with energy.

In the illustration above, the work done is the product of the force (12N) used to push the box and the distance (5m).

= 12 N × 5 m = 60 J

Joules Converter:

Larger units are KiloJoule (KJ) and MegaJoule (MJ)

1,000 Joules (J) = 1 KiloJoule (KJ)

1,000,000 Joules (J) = 1 MegaJoule (MJ)

1,000 KiloJoules (KJ) = 1 MegaJoule (MJ)

Example 1

If a force of 20 N is used to pull a Wheelbarrow through a distance of 8 m. How much work is done in the process.

 

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